For Windows, superseded by Windows Installer patching (i.e., creating
.msp files), which is something completely different. (And quite hard
to get working... but still a saner approach, I think.)

For Linux, many distros use delta RPMs or similar, so no home-grown
LO-specific patching mechanism is needed.

Remove the -patch and -patchinc command-line options to
make_installer.pl and all code that was invoked only when using those.

Remove the PATCH and PATCH_ONLY flags in scp2.

Remove the patchmsi.dll Windows Installer custom action.

Change-Id: I09e949e601a969f88eff60067faa2352f4f89537
Reviewed-on: https://gerrit.libreoffice.org/1605Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Miklos Vajna <vmiklos@suse.cz>